THIS MANUAL IS THE PROPERTY OF THE OWNER. PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.

Inspection on Arrival1. Inspect unit upon arrival. In case of damage, report it

immediately to transportation company and your local Modine sales representative.

2. Check rating plate on unit to verify that power supply meets available electric power at the point of installation.

3. Inspect unit upon arrival for conformance with description of product ordered (including specifications where applicable).

Table of ContentsInspection on Arrival . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2SI (Metric) Conversion Factors. . . . . . . . . . . . . . . . . . . . . . . . . 3Before you Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Unit Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Combustible Material and Service Clearances . . . . . . . . . 4 Unit Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Gas Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 High Altitude Accessory Kit . . . . . . . . . . . . . . . . . . . . . 13-14 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-16 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Service/Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Unit Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Serial/Model Number/Replacement Parts . . . . . . . . . . . . . . . 22Commercial Warranty. . . . . . . . . . . . . . . . . . . . . . . . Back Cover

INSTALLATION AND SERVICE MANUALseparated combustion gas-fired unit heaters

model HDS and HDC

6-584.125H0800020000

April 2018

All models approved for use in California by the CEC and in Massachusetts. Unit heater is certified for residential and commercial applications.

WARNING1. Improper installation, adjustment, alteration,

service or maintenance can cause property damage, injury or death, and could cause exposure to substances which have been determined by various state agencies to cause cancer, birth defects or other reproductive harm. Read the installation, operating and maintenance instructions thoroughly before installing or servicing this equipment.

2. Do not locate ANY gas-fired units in areas where chlorinated, halogenated, or acidic vapors are present in the atmosphere. These substances can cause premature heat exchanger failure due to corrosion, which can cause property damage, serious injury, or death.

FOR YOUR SAFETYThe use and storage of gasoline or other flammable vapors and liquids in open containers in the vicinity of this appliance is hazardous.

FOR YOUR SAFETYWHAT TO DO IF YOU SMELL GAS:

1. Open windows.2. Do not try to light any appliance.3. Do not touch any electrical switch; do not use any phone in your building.4. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions. If you can not reach your gas supplier, call your fire department.

IMPORTANTThe use of this manual is specifically intended for a qualified installation and service agency. All installation and service of these units must be performed by a qualified installation and service agency.

2 6-584.12

SPECIAL PRECAUTIONSSPECIAL PRECAUTIONSTHE INSTALLATION AND MAINTENANCE INSTRUCTIONS IN THIS MANUAL MUST BE FOLLOWED TO PROVIDE SAFE, EFFICIENT AND TROUBLE-FREE OPERATION. IN ADDITION, PARTICULAR CARE MUST BE EXERCISED REGARDING THE SPECIAL PRECAUTIONS LISTED BELOW. FAILURE TO PROPERLY ADDRESS THESE CRITICAL AREAS COULD RESULT IN PROPERTY DAMAGE OR LOSS, PERSONAL INJURY, OR DEATH. THESE INSTRUCTIONS SUBJECT TO ANY MORE RESTRICTIVE LOCAL OR NATIONAL CODES.HAZARD INTENSITY LEVELS1. DANGER: Indicates an imminently hazardous situation which, if not avoided, WILL result in death or serious injury.2. WARNING: Indicates a potentially hazardous situation which, if not avoided, COULD result in death or serious injury.3. CAUTION: Indicates a potentially hazardous situation which,

if not avoided, MAY result in minor or moderate injury.4. IMPORTANT: Indicates a situation which, if not avoided, MAY result in a potential safety concern.

DANGERAppliances must not be installed where they may be exposed to a potentially explosive or flammable atmosphere.

WARNING1. Gas fired heating equipment must be vented - do not operate unvented.2. A built-in power exhauster is provided - additional external power exhausters are not required or permitted.3. If an existing heater is being replaced, it may be necessary to resize the venting systems. Improperly sized venting systems can result in vent gas leakage or the formation of condensate. Refer to the National Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA B149.1 latest edition. Failure to follow these instructions can result in injury or death.4. Under no circumstances should two sections of double wall vent pipe be joined together within one horizontal vent system due to the inability to verify complete seal of inner pipes. 5. All field gas piping must be pressure/leak tested prior to operation. Never use an open flame. Use a soap solution or equivalent for testing.6. Gas pressure to appliance controls must never exceed 14" W.C. (1/2 psi).7. To reduce the opportunity for condensation, the minimum sea level input to the appliance, as indicated on the serial plate, must not be less than 5% below the rated input, or 5% below the minimum rated input of dual rated units. 8. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.9. All appliances must be wired strictly in accordance with wiring diagram furnished with the appliance. Any wiring different from the wiring diagram could result in a hazard to persons and property. 10. Any original factory wiring that requires replacement must be replaced with wiring material having a temperature rating of at least 105°C.11. Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not 5% greater than the rated voltage.12. When servicing or repairing this equipment, use only factory-approved service replacement parts. A complete replacements parts list may be obtained by contacting the factory. Refer to the rating plate on the appliance for complete appliance model number, serial number, and company address. Any substitution of parts or controls not approved by the factory will be at the owner's risk.

CAUTION1. All literature shipped with this unit should be kept for future use for servicing or service diagnostics. Do not discard any literature shipped with this unit.2. Consult piping, electrical, and venting instructions in this manual before final installation.3. Do not attach ductwork, air filters, or polytubes to any propeller unit heater.4. Clearances to combustible materials are critical. Be sure to follow all listed requirements.5. Low profile heaters are designed for use in heating applica- tions with ambient startup temperatures between -40°F and

90°F, and ambient operating temperatures between 40°F and 90°F.

6. Do not install unit outdoors.7. In garages or other sections of aircraft hangars such as offices and shops that communicate with areas used for servicing or storage, keep the bottom of the unit at least 7' above the floor unless the unit is properly guarded to provide user protection from moving parts. In parking garages, the unit must be installed in accordance with the standard for parking structures ANSI/NFPA 88A latest edition, and in repair garages the standard for repair garages

NFPA 30A - latest edition (Formerly NFPA 88B). In Canada, installation of heaters in airplane hangars must be in accordance with the requirements of the enforcing authority, and in public garages in accordance with the current CSA-B149 codes.

8. In aircraft hangars, keep the bottom of the unit at least 10' from the highest surface of the wings or engine enclosure of the highest aircraft housed in the hangars and in accordance with the requirements of the enforcing authority and/or NFPA 409-latest edition.9. Installation of units in high humidity or salt water atmospheres will cause accelerated corrosion resulting in a reduction of the normal life of the units.10. Do not install units below 7' measured from the bottom of the unit to the floor in commercial applications (unless unit is properly guarded to provide user protection from moving parts) and 5' measured from the bottom of the unit to the floor in residential applications.11. Be sure no obstructions block air intake and discharge of unit heaters.12. The minimum distance from combustible material is based on the combustible material surface not exceeding 160°F. Clearance from the top of the unit may be required to be greater then the minimum specified if heat damage, other than fire, may occur to materials above the unit heater at the temperature described.13. Allow 18" of clearance at rear (or 6" beyond end of motor at rear of unit, whichever is greater) and access side to provide ample air for proper operation of fan.14. Installation must conform with local building codes or in the

absence of local codes, with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) - latest edition. In Canada installation must be in accordance with CSA-B149.1.

15. The concentric vent adapter box must be installed inside of the structure or building. Do not install this box on the exterior of a building or structure.

16. Purging of air from gas supply line should be performed as described in the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) - latest edition, or, or in Canada in CSA-B149 codes.

17. When leak testing the gas supply piping system, the appliance and its combination gas control must be isolated during any pressure testing in excess of 14" W.C. (1/2 psi).

6-584.12

BEFORE YOU BEGIN

In the U.S., the installation of these units must comply with the National Fuel Gas Code, ANSI Z223.1 - latest edition (NFPA 54) and other applicable local building codes. In Canada, the installation of these units must comply with local plumbing or waste water codes and other applicable codes and with the current code CSA-B149.1. 1. All installation and service of these units must be

performed by a qualified installation and service agency only as defined in ANSI Z223.1, latest edition or in Canada by a licensed gas fitter.

2. This unit is certified with the controls furnished. For replacements parts, please order according to the replacement parts list on serial plate. Always know your model and serial numbers. The right is reserved to substitute other authorized controls as replacements.3. Unit is balanced for correct performance. Do not alter fan or operate motors at speeds below what is shown in this manual.4. Information on controls is supplied separately.5. The same burner is used for natural and propane gas.

3

SPECIAL PRECAUTIONS / SI (METRIC) CONVERSION FACTORS

CAUTION18. The unit should be isolated from the gas supply piping system by closing its field installed manual shut-off valve. This manual shut-off valve should be located within 6' of the heater.19. Turn off all gas before installing appliance.20. Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not 5% less than the rated voltage.21. Check the gas inlet pressure at the unit upstream of the combination gas control. The inlet pressure should be 6-7" W.C. on natural gas or 12-14" W.C. on propane. If inlet pressure is too high, install an additional pressure regulator upstream of the combination gas control.22. Service or repair of this equipment must be performed by a qualified service agency.23. Do not attempt to reuse any mechanical or electronic ignition controllers which has been wet. Replace defective controller.

IMPORTANT1. To prevent premature heat exchanger failure, do not locate

ANY gas-fired appliances in areas where corrosive vapors (i.e. chlorinated, halogenated or acid) are present in the atmosphere.

2. To prevent premature heat exchanger failure, the input to the appliance as indicated on the serial plate, must not exceed the rated input by more then 5%.

3. To prevent premature heat exchanger failure, observe heat exchanger tubes. If the tubes become red while blower and furnace are in operation, check to be sure the blower has been set to the proper rpm for the application. Refer to page 15 for blower adjustments.

4. Start-up and adjustment procedures must be performed by a qualified service agency.

SI (METRIC) CONVERSION FACTORS

To check most of the possible remedies in the troubleshooting guide listed in Table 19.1, refer to the applicable sections of the manual.

CAUTION1. All literature shipped with this unit should be kept for future

use for servicing or service diagnostics. Leave manual with the owner. Do not discard any literature shipped with this unit.

2. Consult piping, electrical, and venting instructions in this manual before final installation.

3. Do not attach ductwork, air filters, or polytubes to any propeller unit heater.

To Convert Multiply By To Obtain "W.C. 0.249 kPa °F (°F-32) x 5/9 °C Btu 1.06 kJ Btu/ft3 37.3 kJ/m3

Btu/hr 0.000293 kW CFH (ft3/hr) 0.000472 m3/min CFH (ft3/hr) 0.00000787 m3/s CFM (ft3/min) 0.0283 m3/min CFM (ft3/min) 0.000472 m3/s

To Convert Multiply By To Obtain feet 0.305 m Gal/Hr. 0.00379 m3/hr Gal/Hr. 3.79 l/hr gallons 3.79 l Horsepower 746 W inches 25.4 mm pound 0.454 kg psig 6.89 kPa psig 27.7 "W.C.

6-584.12

UNIT LOCATION

Location Recommendations1. When locating the heater, consider general space and

heating requirements, availability of gas and electrical supply, and proximity to vent locations.

2. When locating units, it is important to consider that the combustion air and exhaust vent piping must be connected to the outside atmosphere. Vent terminals should be located adjacent to one another. Maximum equivalent vent lengths are listed in “Section A - General Instruction - All Units” of the venting instructions.

3. Be sure the structural support at the unit location site is adequate to support the unit's weight. For proper operation the unit must be installed in a level horizontal position.

4. Do not install units in locations where the flue products can be drawn into the adjacent building openings such as windows, fresh air intakes, etc.

5. Be sure that the minimum clearances to combustible materials and recommended service clearances are maintained. Units are designed for installation with the minimum clearances as shown in Table 4.1.

Table 4.1 - Clearances

6. Do not install units in locations where gas ignition system is exposed to water spray, rain, or dripping water.

7. Mounting height (measured from bottom of unit) at which unit heaters are installed is critical. Refer to mounting height and heat throw data on page 16 of this manual. The maximum mounting height for any unit is that height above which the unit will not deliver heated air to the floor.

Turning The Unit 180° (Model sizes 30-75 only)All units are produced at the factory with left-side controls (when looking at the unit). If the installation requires the controls to be on the right side, all HDS/HDC heaters - with the exception of the 100 and 125 - can be turned-over by following the instructions below.• Byturningtheunit180°fromthewayitwasreceivedfrom

the factory, the sides become opposite but the front and back remain in the same relative position. The bottom panel now becomes the top panel and vice-versa.

• Removetheaccesspanel,turnit180°,andre-attachittothe unit so that all the information labels can be read.

• Removethespring-loadeddeflectorblades,turnthemover,replace, and adjust so they are open and in a position to direct the heated air down to the floor.

UNIT LOCATION

4

DANGERAppliances must not be installed where they may be exposed to a potentially explosive or flammable atmosphere.

IMPORTANTTo prevent premature heat exchanger failure, do not locate ANY gas-fired appliances in areas where corrosive vapors (i.e. chlorinated, halogenated or acid) are present in the atmosphere.

CAUTION1. Clearances to combustible materials are critical. Be sure to follow all listed requirements.2. Low profile heaters are designed for use in heating

applications with ambient startup temperatures between -40°F and 90°F, and ambient operating temperatures between 40°F and 90°F.

3. Do not install unit outdoors.4. In garages or other sections of aircraft hangars such

as offices and shops that communicate with areas used for servicing or storage, keep the bottom of the unit at least 7' above the floor unless the unit is properly guarded. In parking garages, the unit must be installed in accordance with the standard for parking structures ANSI/NFPA 88A-latest edition, and in repair garages the standard for repair garages NFPA 30A - latest edition (Formerly NFPA 88B). In Canada, installation of heaters in airplane hangars must be in accordance with the requirements of the enforcing authority, and in public garages in accordance with the current CSA-B149 codes.

5. In aircraft hangars, keep the bottom of the unit at least 10' from the highest surface of the wings or engine enclosure of the highest aircraft housed in the hangars and in accordance with the requirements of the enforcing authority and/or NFPA 409-latest edition.6. Installation of units in high humidity or salt water

atmospheres will cause accelerated corrosion, resulting in a reduction of the normal life of the units.

Recommended ServiceClearance

HDS HDC HDS/HDCTop and Bottom 1" 6" 18"

Access Side 1" 6" 18"Non Access Side 1" 6" 18"

Rear 18" 18" 18"Vent Connector 4" 4" 18"

Unit SideClearance to

Combustible Material

56-584.12

1. Be sure the means of suspension is adequate to support the weight of the unit (see page 18 for unit weights).

2. For proper operation, the unit must be installed in a level horizontal position.

3. Clearances to combustibles as previously specified must be strictly maintained.

4. For model sizes 30-75, before lifting the heater for suspension, the mounting brackets must be installed as follows (for bracket accessory installation on model sizes 100-125, see the latest revision of literature 6-594):

•Forstandard(leftside)controlaccess,removethe3screws and mounting bracket along the top edge of both the front and back of the unit. Install the front bracket as shown in Figure 5.1 by aligning the screw holes on the bracket with the screw holes on the top edge of the unit. Repeat for the bracket on the back of the unit.

•Forrightsidecontrolaccess,removethe3screwsandmounting bracket along the top edge of both the front and back of the unit. Turn the unit over and install the front bracket as shown in Figure 5.2 by aligning the screw holes on the bracket with the screw holes on the top edge of the unit (originally the bottom edge). Repeat for the bracket on the back of the unit.

5a. Suspension by screws/lag bolts: Secure the mounting brackets to the ceiling joists or truss, using 1/4" screws with 1/2" washers. These unit mounting brackets are slotted to accommodate joists on 16" or 24" centerlines. See page 18 for mounting bracket dimensions.

5b. Suspension by threaded rod: The unit can also be hung with threaded rod utilizing the same mounting brackets. Attach the threaded rod to the unit mounting brackets, securing with a top and bottom nut. For model sizes 100-125, the units are designed to be suspended by threaded rod without the use of brackets. On each piece of 3/8" threaded rod used, screw a nut a distance of about 1" onto the end of the threaded rods that will be screwed into the unit heater. Place a washer over the end of the threaded rod and screw the threaded rod into the unit heater weld nuts on the top of the heater at least 5 turns, and no more than 10 turns. Tighten the nut first installed onto the threaded rod to prevent the rod from turning.

Next, drill holes into a steel channel or angle iron at the same centerline dimensions as those chosen for the heater being installed. The steel channels or angle iron pieces need to span and be fastened to appropriate structural members. Cut the threaded rods to the preferred length, push them through the holes in the steel channel or angle iron and secure with washers and lock nuts, lock washers and nuts, or a washer with double nut arrangement. NOTE: A pipe hanger adapter kit, shown in Figure 5.3, is available as an accessory. One kit consists of four drilled 3/4" IPS pipe caps and four 3/8" - 16 x 1-3/4" capscrews to facilitate threaded pipe suspension.

5c. Shelf mounted units: The unit heater can also be installed on a shelf. The mounting brackets will need to be attached to the heater the same manner as explained in note #4, however, to mount on a shelf the brackets must go on the bottom of the heater. The brackets must be affixed to the shelf using similar screws (1/4" screw with 1/2" washer) as overhead joist or truss mounting. Be sure all clearance to combustible requirements are met.

UNIT MOUNTING

Figure 5.1 - Unit Heater in Standard Mounting Configuration (30-75 units only)

CAUTION1. Do not install units below 7' measured from the bottom of the unit to the floor in commercial applications (unless unit is properly guarded to provide user protection from moving parts) and 5' measured from the bottom of the unit to the floor in residential applications. 2. Be sure no obstructions block air intake and discharge of unit heaters.3. The minimum distance from combustible material is based on the combustible material surface not exceeding 160°F. Clearance from the top of the unit may be required to be greater than the minimum specified if heat damage, other than fire, may occur to materials above the unit heater at the temperature described.4. Allow 18" clearance at rear (or 6" beyond end of motor at rear of unit, whichever is greater) and access side to provide ample air for proper operation of fan.

Figure 5.3 - Unit Heater Suspension Methods

(Threaded Rod) (Pipe Adaptor Kit)

Figure 5.2 - Unit Heater Turned 180° (30-75 units only)(Access panel and heated air outlet change sides)

6 6-584.12

Model HDS/HDC unit heaters must be vented with the proper passageway as described in these instructions to convey flue gases from the unit or the vent connector to the outside atmosphere. The heaters must also have a separate combustion air intake pipe to bring in fresh air for combustion from the outside atmosphere. The venting instructions are organized in sections, based on installation type. The sections are identified as follows:

Instructions Applicable Installation Instructions Section by Vent System Type A General instructions for ALL installations B VERTICAL 2-PIPE vent systems j C HORIZONTAL 2-PIPE vent systems j D HORIZONTAL AND VERTICAL CONCENTRIC vent systems jj The differences between vertical and horizontal vent systems in 2-Pipe or

concentric vent configurations will be identified in “Section A - General Instructions – All Units”.

Section A – General Instructions – All UnitsA1. If the unit heater being installed is replacing existing

equipment and using the existing vent system from that equipment, inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code ANSI Z223.1 or CSA B149.1 Installation Code-latest edition and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies, which could cause an unsafe condition.

A2. The combustion air pipe and vent pipe should be galvanized steel or other suitable corrosion resistant material. Follow the National Fuel Gas Code for minimum thickness of vent material. The minimum thickness for connectors varies depending on the pipe diameter. Do not vent unit with PVC or other forms of plastic venting material.

A3. All heaters come with factory installed vent and combustion air adapters for attaching the vent pipe to the heater. Attach the vent pipe to the adapter with 3 corrosion resistant screws. (Drill pilot holes through the vent pipe and adapter prior to screwing in place). Vent pipe must not be smaller than the connector size.

A4. Refer to Table 6.1 for total equivalent vent pipe lengths, making the vent system as straight as possible. The equivalent length of a 3” elbow is 1’ and for a 4” elbow is 5’.

A5. A minimum of 12" straight pipe is recommended from the flue outlet before turns in the vent pipe.

A6. Horizontal sections of vent pipe are to be installed with a minimum downward slope from the appliance of 1/4" per foot and suspended securely from overhead structures at points not greater than 3' apart.

A7. Fasten individual lengths of vent together with at least 3 corrosion-resistant sheet metal screws.

A8. Keep single wall vent pipe at least 6" from combustible materials. For double wall vent pipe, follow the vent pipe manufacturer’s clearances to combustibles. The minimum distance from combustible materials is based on the combustible material surface not exceeding 160°F. Clearance from the vent pipe (or the top of the unit) may be required to be greater than 6" if heat damage other than fire could result (such as material distortion or discoloration).

A9. Avoid venting through unheated space when possible. When venting does pass through an unheated space or if the unit is installed in an environment that promotes condensation, insulate runs greater than 5' to minimize condensation. Inspect for leakage prior to insulating and use insulation that is noncombustible with a rating of not less than 400°F. Install a tee fitting at the low point of the vent system and provide a drip leg with a clean out cap as shown in Figure 8.1.

INSTALLATION - VENTING

WARNING1. Gas fired heating equipment must be vented - do not

operate unvented.2. A built-in power exhauster is provided - additional external

power exhausters are not required or permitted.3. If an existing heater is being replaced, it may be necessary

to resize the venting systems. Improperly sized venting systems can result in vent gas leakage or the formation of condensate. Refer to the National Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA-B149.1 Installation Code - latest edition. Failure to follow these instructions can result in serious injury or death.

4. Under no circumstances should 2 sections of double wall vent pipe be joined together within 1 horizontal vent system due to the inability to verify complete seal of inner pipes.

CAUTIONInstallation must conform with local building codes or in the absence of local codes, with Part 7, Venting of Equipment, of the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) - latest edition. In Canada installation must be in accordance with CSA B149.1.

Figure 6.1 - Venting Through Combustible Roof or Wall

Flashing

ListedThimble

ListedTerminal

ListedTerminal

Flashing

Clearance Specified by Type B Vent Mfg.

ListedThimble

Single Wall Vent Pipe Double Wall Vent Pipe j

Single Wall Vent Pipe Terminating with Double wall vent pipe. j

Single Wall Vent Pipe

j See Instruction A12 for attaching single wall pipe to double wall pipe.

Double Wall

Single Wall

ListedTerminal

Clearance Specified by Type B Vent Mfg.

Single Wall

ListedTerminal

Table 6.1 - Vent Pipe Diameters, Transitions, andTotal Equivalent Vent Pipe Lengths For Horizontaland Vertical Venting Systems

Model Size

Vent Pipe Sizes

MinimumEqv. Length

MaximumEqv. Length

30-45 3" 3' 25'60-125 4" 3' 25'

6-584.12

A10. When the vent passes through a combustible INTERIOR wall or floor, a metal thimble 4" greater than the vent diameter is necessary. If there is 6' or more of vent pipe in the open space between the appliance and where the vent pipe passes through the wall or floor, the thimble need only be 2" greater than the diameter of the vent pipe. If a thimble is not used, all combustible material must be cut away to provide 6" of clearance. Where authorities have jurisdiction type B vent may be used for the last section of vent pipe to maintain clearance to combustibles while passing through wall or floor (see Figure 6.1). Any material used to close the opening must be noncombustible.

A11. Seal all seams and joints of un-gasketed single wall pipe with metal tape or Silastic suitable for temperatures up to 400°F. Wrap the tape 2 full turns around the vent pipe. One continuous section of double wall vent pipe may be used within the vent system to pass through the wall to a listed vent cap. Refer to instruction A12 in “Section A – General Instructions – All Units” for attaching double wall pipe to single wall pipe.

A12. The following are general instructions for double wall (type B) terminal pipe installation:

How to attach a single wall vent terminal to double wall (type B) vent pipe:1. Look for the “flow” arrow on the vent pipe. 2. Slide the vent terminal inside the exhaust end of the

double wall vent pipe.3. Drill 3 holes through the pipe and the vent terminal.

Using 3/4" long sheet metal screws, attach the cap to the pipe. Do not overtighten.

How to connect a single wall vent system to a double wall (type B) vent pipe: 1. Slide the single wall pipe inside the inner wall of the

double wall pipe.2. Drill 3 holes through both walls of the single and double

wall vent pipes. Using 3/4" sheet metal screws, attach the 2 pieces of pipe. Do not overtighten.

3. The gap between the single and double wall pipe must be sealed but it is not necessary to fill the full volume of the annular area. To seal, run a large bead of 400°F silastic around the gap.

A13. Vent termination clearances must be maintained:

A14. Do NOT vent this appliance into a masonry chimney. A15. Do NOT use dampers or other devices in the vent or

combustion air pipes.A16. The venting system must be exclusive to a single

appliance, and no other appliance is allowed to be vented into it.

A17. Precautions must be taken to prevent degradation of building materials by flue products.

A18. Single wall vent pipe must not pass through any unoccupied attic, inside wall, concealed space, or floor.

A19. Uninsulated single wall vent pipe must not be used outdoors for venting appliances in regions where the 99% winter design temperature is below 32°F.A19. Long runs of horizontal or vertical combustion air pipes may require insulation in very cold climates to prevent the buildup of condensation on the outside of the pipe where the pipe passes through conditioned spaces.

A20. Vertical combustion air pipes should be fitted with a tee with a drip leg and a clean out cap to prevent against the possibility of any moisture in the combustion air pipe from entering the unit. The drip leg should be inspected and cleaned out periodically during the heating season.

A21. The vent terminal must be:

A22. In addition to following these general instructions, specific instructions for vertical and horizontal vent systems in 2-Pipe or concentric vent configurations must also be followed. The following outlines the differences:

Vertical Category III Vent System Determination• Verticalventsystemsterminatevertically(up)(anexampleis

shown in Figure 8.1).• Determinetheventingconfigurationasfollows: > For two building penetrations through the wall or roof (one

for the combustion air inlet pipe and one for the vent pipe), proceed to “Section B - Vertical 2-Pipe Venting”.

> For a single larger building penetration through the wall or roof, through which both the combustion air inlet and vent pipes will pass, proceed to “Section D - Horizontal and Vertical Concentric Venting”.

> For all other cases, proceed to the next section for Horizontal Vent System Determination.

Horizontal Category III Vent System Determination• Horizontalventsystemsterminatehorizontally(sideways)

(an example is shown in Figure 9.1).• Determinetheventingconfigurationasfollows: > For two building penetrations through the wall or roof (one

for the combustion air inlet pipe and one for the vent pipe), proceed to “Section C - Horizontal 2-Pipe Venting”.

> For a single larger building penetration through the wall or roof, through which both the combustion air inlet and vent pipes will pass, proceed to “Section D - Horizontal and Vertical Concentric Venting”.

7

INSTALLATION - VENTING

Minimum Clearances for Structure Vent Terminal Location Forced air inlet within 10 feet 3 feet aboveCombustion air inlet of another appliance 6 feet all directionsDoor, window, gravity air inlet, 4 feet horizontal and belowor any building opening 1 foot aboveElectric meter, gas meter, gas 4 feet horizontal (U.S.)regulator, and relief equipment j 6 feet horizontal (Canada)Gas regulator j 3 feet horizontal (U.S.) 6 feet horizontal (Canada)Adjoining building or parapet wall 6 feet all directionsAdjacent public walkways 7 feet all directionsGrade (ground level) 3 feet above

Table 7.1 - Vent Termination Clearances

j Do not terminate the vent directly above a gas meter or regulator.

Table 7.2 - Vent Terminals (two pipe)Model Size Modine PN Other Listed Terminals

30-45 5H0722850005 Gary Steel 1092

60-75 5H0722850001 Gary Steel 1092

100-125 5H0722850001 Gary Steel 1092

8 6-584.12

Section B – Vertical 2-Pipe Vent System InstallationB1. This section applies to vertically vented 2-pipe (one

combustion air inlet pipe and one vent pipe) vent systems and is in addition to “Section A – General Instructions – All Units”.

B2. Vertical vent systems terminate vertically (up).B3. It is recommended to install a tee with drip leg and clean out

cap as shown in Figure 8.1.B4. The combustion air and vent pipes must be terminated with

2 listed vent caps.B5. Vertical vents must terminate a minimum horizontal and

vertical distance from roof lines and adjacent walls or obstructions. These minimum distances are outlined in Figure 8.1 and Table 8.1.

B6. The vent must terminate at least 1' above and 6" horizontally from the combustion air inlet.

INSTALLATION - VENTING

"H" MIN*

12" MIN RECOMMENDED

4" MIN

BACK VIEW

ROOF PITCH IS:X / 12

MINIMUM DISTANCE TO ADJOINING WALL OR BUILDING IS 2 FEET.

REFER TO TABLE 8.1 FOR "H" DIMENSION.

"H" MIN*(SEE TABLE 8.1)

TEE WITH DRIP LEG AND CLEANOUT CAP (SLOPE 1/4" PER FOOT DOWNWARD TOWARD DRIP LEG)

COMBUSTION AIR

ROOF FLASHING

USE LISTED THIMBLE THROUGH ROOF AND CEILING

EXHAUST

USE LISTED THIMBLES THROUGH CEILING AND ROOF

12

X

ROOF FLASHING

CO

MB

US

TIO

N A

IR

EX

HA

US

T

TEE WITH DRIP LEGAND CLEANOUT CAP

LISTEDTERMINAL

LISTEDTERMINAL

"H" MIN*(SEE TABLE 8.1)

"H" MIN*(SEE TABLE 8.1)

Table 8.1 - Minimum Height from Roof to Lowest Discharge Opening

Rise X (in) Roof Pitch Min Height H (ft) j 0-6 Flat to 6/12 1.00 6-7 6/12 to 7/12 1.25 7-8 7/12 to 8/12 1.50 8-9 8/12 to 9/12 2.00 9-10 9/12 to 10/12 2.50 10-11 10/12 to 11/12 3.25 11-12 11/12 to 12/12 4.00 12-14 12/12 to 14/12 5.00 14-16 14/12 to 16/12 6.00 16-18 16/12 to 18/12 7.00 18-20 18/12 to 20/12 7.50 20-21 20/12 to 21/12 8.00 j Size according to expected snow depth.

Com

bust

ion

Air

Exh

aust

* SIZE ACCORNING TO EXPECTED SNOW DEPTH.

TO WALL OR ADJOINING BUILDING

12" MIN

12" MIN*

2' MIN 6" MIN

USE THIMBLE THROUGH CELLING

TEE WITH DRIP LEG AND CLEANOUT CAP

ROOF FLASHING

LISTEDTERMINAL

LISTEDTERMINAL

Figure 8.2 - Vertical 2-Pipe Vent System - Flat Roof

B9. Once venting is complete, proceed section titled “Installation – Gas Connections”.

Figure 8.1 - Vertical 2-Pipe Vent System - Sloped Roof

96-584.12

Section C – Horizontal 2-Pipe Vent System InstallationC1. This section applies to horizontally vented 2-pipe vent

systems (one combustion air inlet pipe and one vent pipe) and is in addition to “Section A – General Instructions – All Units”. Category III vent systems listed by a nationally recognized agency and matching the diameters specified may be used. Different brands of vent pipe materials may not be intermixed. Under no circumstances should two sections of double wall vent pipe be joined together within one horizontal vent system due to the inability to verify complete seal of inner pipes.

C2. Horizontal vent systems terminate horizontally (sideways).

C3. All horizontal vents must be terminated with a listed vent cap. The cap must terminate a minimum distance from the external wall, as summarized in Figure 9.1.

C4. The termination of horizontally vented system must extend 16" beyond the exterior surface of an exterior wall.

C5. The combustion air pipe must be a minimum of 6" below the vent pipe, and 4" from the exterior wall.

C6. Construct the vent system as shown in Figure 9.1.

C7. When horizontal vents pass through a combustible wall (up to 22" thick), the vent passage must be constructed and insulated as shown in Figure 9.2.

C8. The vent must be supported as shown in Figure 9.2.

C9. When condensation may be a problem, the vent system shall not terminate over public walkways or over an area where condensate or vapor could create a nuisance or hazard or could be detrimental to the operation of regulators, relief openings, or other equipment.

C10. Maintain a 1/4" per foot downward slope away from the heater and place a drip leg with clean out near the exit of the vent as shown in Figure 9.1, or allow the condensate to drip out the end.

C11. For a vent termination located under an eave, the distance of the overhang must not exceed 24". The clearance to combustibles above the exterior vent must be maintained at a minimum of 12". Consult the National Fuel Gas Code for additional requirements for eaves that have ventilation openings.

C12. Once venting is complete, proceed to section titled “Installation – Gas Connections”.

INSTALLATION - VENTING

METALSLEEVE

FIBER GLASSINSULATION

MIN. 2"2" MIN.

VENT TERMINATIONSUPPORT BRACKET

(where required)(Make from 1" x 1" steel angle)

9"

9"451"

METALSLEEVE

2" MIN.

VENT PIPEDIAMETER

METAL FACEPLATE 1"

Figure 9.2 - Exhaust Vent Construction Through Combustible Walls and Support Bracket

Figure 9.1 - Horizontal Venting with Downward Pitch

COMBUSTION AIR

EXHAUST

SLOPE 1/4" PER FOOT DOWNWARD FROM UNIT

TEE WITH DRIP LEG AND CLEANOUT CAP AT LOW POINT OF VENT SYSTEM

LISTEDTERMINAL

SUPPORT BRACKET

6" MIN

2' MIN

4" MIN

12"

ADJACENT BUILDING

10 6-584.12

INSTALLATION - VENTINGSection D – Concentric Vent System InstallationD1. This section applies to both horizontally and vertically

vented concentric vent systems as defined in “Section A – General Instructions – All Units”, and is in addition to the instructions in that section.

D2. When utilizing the concentric vent option, it should have been predetermined whether the appliance will be horizontally or vertically vented. Before proceeding, verify that the concentric vent kit received contains the correct components for the installation:

For Vertically Vented Units (Refer to Figure 10.1): j Concentric adapter assembly (same for horizontal and

vertical kits) k Standard listed vent cap l Specially designed inlet terminal (part #5H0751540001)

For Horizontally Vented Units (Refer to Figure 10.2): j Concentric adapter assembly (same for horizontal and

vertical kits) k Special vent termination cap (part #5H0751500001) l Special inlet air guard

D3. Once the kit contents have been verified as correct for the direction of venting, the concentric vent adapter box is to be installed. Determine the location of the box. Be sure to maintain all clearances as listed in these instructions.

D4. The adapter box is to be mounted on the interior side of the building. It must not be mounted outside the building. The adapter box has integral mounting holes for ease of installation.

D5. The adapter box can be mounted flush to the wall (for horizontal kits) or to the ceiling (for vertical kits). The box can also be offset from the wall or ceiling by using field supplied brackets. When mounting the box, consider serviceability and access to the vent and combustion air pipes. If the box is to be mounted using field supplied brackets, these brackets must be strong enough to rigidly secure the box to the wall or ceiling, and should be made from corrosion resistant material.

D6. Determine the length of the vent pipe and combustion air inlet pipe for the selected location. THE VENT PIPE WILL PASS THROUGH THE CONCENTRIC VENT BOX. THE LAST SECTION OF VENT PIPE IS A CONTINUOUS LENGTH OF DOUBLE WALL “B” VENT. See section A12 for attaching and terminating double wall pipe. Begin with pipe lengths on the concentric pipe side of the adapter box referring to Figures 10.1 and 10.2. These pipes will extend through the building wall or roof as well as any added length for the thickness of the wall and the offset from any field installed brackets.

For Vertical Concentric Vent Kits (refer to Figure 10.1):

•Thebottomofthecombustionairintakepipemustterminate above the snow line, or at least 12" above the roof, whichever distance is greater.

•Thebottomoftheventcapmustterminateatleast6"above the top of the combustion air intake cap.

For Horizontal Concentric Vent Kits (refer to Figure 10.2):

•Thecombustionairintakepipemustterminateatleast 1" from the wall to prevent water from running down the wall and into the pipe.

•Thebackoftheventcapmustterminateatleast14"fromthe combustion air intake pipe.

D7. Cut the concentric side vent and combustion air pipes to the proper length as determined in the previous step. See Table 11.1 for combustion air and vent pipe sizes. The pipes must be single wall galvanized or stainless steel material, except for the last section of vent pipe, which must be one continuous length of double wall B-vent extended through the concentric vent box and combustion air inlet pipe on the concentric side of the box.

D8. Allow the concentric side vent pipe to pass through the concentric vent adapter box, as shown in Figure 11.1. Attach the double wall vent pipe to the single wall vent pipe that goes to the unit. Be sure to seal the joint and the open area around the double wall vent. Seal all joints and seams using sealant suitable for temperatures up to 400°F.

Figure 10.1 - Vertical Concentric Vent Kit Components

Figure 10.2 - Horizontal Concentric Vent Kit Components

CAUTIONThe concentric vent adapter box must be installed inside of the structure or building. Do not install this box on the exterior of a building or structure.

Combustion Air Inlet Terminal

Outlet Vent Termination Cap

BuildingRoof / Ceiling

Concentric Vent Adapter Box

Combustion Air Exhaust

6" Min.

12" Min.** Size according to expected snow depth.

116-584.12

INSTALLATION - VENTINGD9. Slide the combustion air pipe over the vent pipe and attach

to the air inlet of the concentric adapter box, as shown in Figure 11.1, using at least 3 corrosion-resistant sheet metal screws. Seal the joint and seam using sealant suitable for temperatures up to 400°F.

D10. Place this assembly (the adapter box, vent pipe and combustion air pipe) through the wall or roof and verify that the distance requirements as defined in Step D7 are met. Securely attach the assembly building.

D11. From outside the building, caulk the gap between the combustion air intake pipe and the building penetration.

D12. Attach the combustion air intake and vent pipe terminations as follows:

For Vertical Concentric Vent Kits (refer to Figure 10.1):

•Slidethecombustionaircapdownovertheventpipeand fasten it to the combustion air pipe with at least 3 corrosion-resistant sheet metal screws.

•Attachtheventcaptotheventpipeusingatleast3 corrosion-resistant sheet metal screws. Refer to instruction A12 for connecting terminal to double wall pipe.

•Caulkthegapbetweenthecombustionaircapandthevent pipe with silicone sealant, or other appropriate sealants suitable for metal to metal contact and for temperatures up to 400° F.

For Horizontal Concentric Vent Kits (refer to Figure 10.2):

•Attachthecombustionairintakeguardusingcorrosion-resistant screws at the end of the combustion air intake pipe to prevent animals and debris from entering.

•Attachtheventcaptotheventpipeusingatleast 3 corrosion-resistant sheet metal screws.

D13. For model sizes 30 and 45, attach the 3" to 4" vent transitions on the non-concentric side vent and combustion air connections using 3 corrosion resistant sheet metal screws.

D14. Install vent pipe and combustion air pipe between unit heater and concentric vent adapter box as outlined in “Section A – General Instructions – All Units”.

D15. Once venting is complete, proceed to the section titled “Installation - Gas Connections”.

Figure 11.1 - Adapter Box with Combustion Air Intake Pipe Attached

Outlet Vent Pipe Extended Through Box

Combustion Air Pipe Attached

13.33"

4.57”

18.84"

Table 11.1 - Concentric Vent Pipe Sizes

Table 11.2 - Vent Terminals (Concentric)

Single Wall Pipe Type B Vent Pipe j

Model Size

Combustion Air (To Unit)

Combustion Air (External)

Vent (Pass-Through)

30-45 3" k 6" 4" k

60-125 4" 6" 4"

j B-Vent must have 1/4" air gap (OD is 1/2" larger than ID).

k Use vent transitions included in concentric vent kit as described in D13.

Figure 11.2 - Adapter Box Exploded Assembly

Model Size Modine PN

30-45 Horizontal Concentric 5H0751500001 Vent Cap 3H0349320004 Intake Guard Assembly

30-45 Vertical Concentric 5H0722850001 Vent Cap 5H0751540004 Intake Cap

60-125 Horizontal Concentric 5H0751500001 Vent Cap 3H0349320004 Intake Guard Assembly

60-125 Vertical Concentric 5H0722850001 Vent Cap 5H0751540004 Intake Cap

12 6-584.12

INSTALLATION - GAS CONNECTIONS

GAS CONNECTIONS

1. Installation of piping must conform with local building codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) - latest Edition. In Canada, installation must be in accordance with CSA-B149.1.

2. Piping to units should conform with local and national requirements for type and volume of gas handled, and pressure drop allowed in the line. Refer to Table 12.1 to determine the cubic feet per hour (CFH) for the type of gas and size of unit to be installed. Using this CFH value and the length of pipe necessary, determine the pipe diameter from Table 12.2. Where several units are served by the same main, the total capacity, CFH and length of main must be considered. Avoid pipe sizes smaller than 1/2". Table 12.2 allows for a 0.3" W.C. pressure drop in the supply pressure from the building main to the unit. The inlet pressure to the unit must be 6-7" W.C. for natural gas and 11-14" W.C. for propane gas. When sizing the inlet gas pipe diameter, make sure that the unit supply pressure can be met after the 0.3" W.C. has been subtracted. If the 0.3" W.C. pressure drop is too high, refer to the Gas Engineer’s Handbook for other gas pipe capacities.

3. Install a ground joint union with brass seat and a manual shut-off valve adjacent to the unit for emergency shut-off and easy servicing of controls, including a 1/8" NPT plugged tapping accessible for test gauge connection (see Figure 12.1).

4. Use 2 wrenches when connecting field piping to units. 5. Provide a sediment trap before each unit in the line where

low spots cannot be avoided (see Figure 12.1).6. When pressure/leak testing, pressures above 14" W.C.

(1/2 psi), close the field installed shut-off valve, disconnect the appliance and its combination gas control from the gas supply line, and plug the supply line before testing. When testing pressures 14" W.C. (1/2 psi) or below, close the manual shut-off valve on the appliance before testing.

Figure 12.1 - Recommended Sediment Trap/Manual Shut-off Valve Installation - Side or Bottom Gas Connection j

j Manual shut-off valve is in the “OFF” position when handle is perpendicular to pipe.

IMPORTANTTo prevent premature heat exchanger failure, the input to the appliance, as indicated on the serial plate, must not exceed the rated input by more than 5%.

Table 12.1 - Sea Level Manifold Pressure & Gas Consumption

Natural PropaneModel BTU/Cu. Ft. 1050 2500 No. ofSize Specific Gravity 0.60 1.53 Orifices

Manifold Pressure In. W.C. 3.5 10.0

CFH 28.6 12.0 2 Gal/Hr. Propane .33 Sec/cu. ft. 126 300 Orifice Drill Size 49 56

CFH 42.9 18.0 3 Gal/Hr. Propane .50 Sec/cu. ft. 84 200 Orifice Drill Size 49 56

CFH 57.1 24.0 4 Gal/Hr. Propane .66 Sec/cu. ft. 63 150 Orifice Drill Size 49 56

CFH 71.4 30.0 5 Gal/Hr. Propane .83 Sec/cu. ft. 50 180 Orifice Drill Size 49 56

CFH 95.2 40 5 Gal/Hr.Propane 1.09 Sec/cu. ft. 38 90 Orifice Drill Size 45 55

CFH 119 50 5 Gal/Hr.Propane 1.37 Sec/cu. ft. 30 72 Orifice Drill Size 42 53

30

45

60

75

100

125

Pipe Length (ft)

Natural Gas1/2" 3/4" 1" 1-1/4" 1-1/2" 2"

10 132 278 520 1050 1600 305020 92 190 350 730 1100 210030 73 152 285 590 890 165040 63 130 245 500 760 145050 56 115 215 440 670 127060 50 105 195 400 610 115070 46 96 180 370 560 105080 43 90 170 350 530 930

100 38 79 150 305 460 870125 34 72 130 275 410 780150 31 64 120 250 380 710

Table 12.2 - Gas Pipe Capacities - Natural Gas jk

j Capacities in cubic feet per hour through Schedule 40 pipe with maximum 0.3" W.C. pressure drop with up to 14" W.C. gas pressure. Specific gravity is 0.60 for natural gas and 1.50 for propane gas.

k For pipe capacity with propane gas, divide natural gas capacity by 1.6. Example: What is the propane gas pipe capacity for 60' of 1-1/4" pipe? The natural gas capacity is 400 CFH. Divide by 1.6 to get 250 CFH for propane gas.

WARNING1. All field gas piping must be pressure/leak tested prior to

operation. Never use an open flame. Use a soap solution or equilavent for testing.

2. Gas pressure to appliance controls must never exceed 14" W.C. (1/2 psi).

3. To reduce the opportunity for condensation, the minimum sea level input to the appliance, as indicated on the serial plate, must not be less than 5% below the rated input, or 5% below the minimum rated input of dual rated units.

CAUTION1. Purging of air from gas lines should be performed as

described in ANSI Z223.1 - latest edition “National Fuel Gas Code”, or in Canada CSA-B149 codes.

2. When leak testing the gas supply piping system, the appliance and its combination gas control must be isolated during any pressure testing in excess of 14" W.C. (1/2 psi).

3. The unit should be isolated from the gas supply piping system by closing its field installed manual shut-off valve. This manual shut-off valve should be located within 6' of the heater.

4. Turn off all gas before installing appliance.

136-584.12

INSTALLATION - HIGH ALTITUDE ACCESSORY KITHIGH ALTITUDE ACCESSORY KIT

Altitude (ft)Gas Heating Values at Altitude (BTU/ft3)

USA Canada0-2,000 1,050 1,050

2,001-3,000 9299453,001-4,000 892

4,001-4,500 8744,501-5,000 856 8565,001-6,000 822 8226,001-7,000 789 7897,001-8,000 757 7578,001-9,000 727 727

9,001-10,000 698 698

Altitude (ft)Gas Heating Values at Altitude (BTU/ft3)

USA Canada0-2,000 2,500 2,500

2,001-3,000 2,2122,2503,001-4,000 2,123

4,001-4,500 2,0804,501-5,000 2,038 2,0385,001-6,000 1,957 1,9576,001-7,000 1,879 1,8797,001-8,000 1,803 1,8038,001-9,000 1,731 1,731

9,001-10,000 1,662 1,662

Table 13.1 - Natural Gas Heating Values at Altitude jlm

Table 13.2 - Propane Gas Heating Values at Altitude klm

Modine’s gas-fired equipment standard input ratings are certified by ETL. For elevations above 2,000', ANSI Z223.1 requires ratings be reduced 4 percent for each 1000' above sea level. For units in Canada, CSA requires that ratings be reduced 10 percent at elevations above 2,000'. The high altitude adjustment instructions and pressure switch kits listed in this manual are for use with units that will be installed over 2,000' These methods and kits comply with both ANSI Z223.1 and CSA requirements.If a unit is to be installed at higher elevations AND converted from natural gas to propane gas operation, a propane conversion kit must be used in conjunction with the pressure adjustment methods and pressure switch kits listed herein. For the selection and installation instructions for propane conversion kits, please see the latest revision of Modine Manual 75-515.

Selection of the Proper Pressure and KitTo determine the proper manifold pressure at altitude and if required, the proper combustion air pressure switch kit, the full model number of the heater, the fuel to be used, and the altitude the unit will be installed at must be known. Refer to the unit serial plate or carton label to obtain the necessary information about the unit.After obtaining this information, refer to the gas pressure and selection charts shown in Tables 13.1 through 13.3. The pressure charts are differentiated by elevation, fuel type, and country the product is being installed in. The selection charts are differentiated by product type, altitude and fuel type. If converting from natural gas to propane gas and operation at high altitude, both a propane conversion kit and a pressure switch kit must be used (if applicable). Selection charts include the proper kit suffix, when required.

Manifold Pressure AdjustmentThe inlet pressure to the unit must be confirmed to be within acceptable limits (6-7" W.C. for natural gas and 11-14" W.C. for propane gas) before opening the shutoff valve or the combination gas valve may be damaged.Heaters for the use with natural gas have gas valves that need to be field adjusted to 3.5" W.C. manifold pressure at 7.0" W.C. inlet pressure. Units for use with propane gas have gas valves that need to be field adjusted to 10.0" W.C. manifold pressure at 14.0" W.C. inlet pressure. Installation above 2,000' elevation requires adjustment of the manifold pressure as described.

Derated BTU Content Gas and Manifold Pressure CalculationSome utility companies may derate the BTU content (heating value) of the gas provided at altitude to a value other than 1,050 BTU/ft3 for natural gas or 2,500 BTU/ft3 for propane gas to allow certain heating appliances to be used with no manifold pressure adjustments. For this reason it is necessary that the supplying utility be contacted for detailed information about the gas type and BTU content (heating value) before operating any heater. Tables 13.1 and 13.2 show the standard derated heating values (4% per 1,000' of elevation in the USA and 10% between 2,001' and 4,500' elevation in Canada) of natural and propane gases at various altitudes. If the utility is supplying gas with heating values as shown in Tables 13.1 and 13.2, the manifold pressure should be set to 3.5" W.C for natural gas and 10.0" W.C. for propane gas.

NOTE: Only the high fire gas pressure need be adjusted, low fire gas pressure should remain the same.

j Values shown are for 3.5" W.C. manifold pressure, for other BTU content values (available from local utility) use Equation 14.1 to calculate manifold pressure. k Values shown are for 10.0" W.C. manifold pressure, for other BTU content values (available from local utility) use Equation 14.1 to calculate manifold pressure. l When installed at altitudes above 2,000', a pressure switch may need to be changed. Refer to Table 13.3 to determine if a switch change is required. m Gas heating values are derated 4% per 1,000' of elevation in the USA and 10% between 2,000' and 4,500' elevation in Canada in accordance with ANSI Z223.1

and CSA-B149, respectively.

Table 13.3 - High Altitude Kits for HDS/HDC jModel Size Details

U.S.A and Canada0-2,000 ft 2,001-2,500 ft 2,501-4,500 ft 4,501-5,500 ft 5,501-6,500 ft 6,501-7,500 ft 7,501-8,500 ft 8,501 - 9,500 ft 9,501-10,000 ft

30 Kit Suffix Not Required Label Only Label Only 0003 0005 0005 0010 0010 0010Item Code 68407 68409 68409 68414 68414 68414

45 Kit Suffix Not Required Label Only 0002 0004 0003 0006 0010 0010 0011Item Code 68406 68408 68407 68410 68414 68414 68415

60 Kit Suffix Not Required Label Only 0003 0003 0005 0007 0011 0011 0011Item Code 68407 68407 68409 68411 68415 68415 68415

75 Kit Suffix Not Required Label Only 0003 0003 0005 0007 0011 0011 0011Item Code 68407 68407 68409 68411 68415 68415 68415

100 Kit Suffix Not Required Label Only Label Only Label Only Label Only 0004 0004 0004 0004Item Code 68408 68408 68408 68408

125 Kit Suffix Not Required Label Only Label Only Label Only 0004 0004 0004 0004 0004Item Code 68408 68408 68408 68408 68408j ForLabelOnlykits,Modinepartnumber5H0807146005isrequiredtobefilledoutandattachedtotheunitbytheinstaller.PleasecontactthelocalModine

representative at 1.866.828.4328 (HEAT).

14 6-584.12

INSTALLATION - HIGH ALTITUDE ACCESSORY KITIf the heating value of the gas being supplied is different than the values shown in Tables 13.1 and 13.2, use the following equation to determine the appropriate manifold pressure for the altitude and gas heating value being supplied.

Equation 14.1 - Manifold Pressure for Derated Gas

WHERE:

MPACT = Manifold Pressure (in. W.C.) at Altitude – Manifold pressure setting for the heater being installed

BTUTBL = BTU/ft3 Content of Gas – Obtained from Tables 13.1 or 13.2 (whichever is applicable)

BTUACT = BTU/ft3 Content of Gas – Obtained from the local utility company

MPSL = Manifold Pressure (in. W.C.), at Sea Level – Use 3.5" W.C. for natural gas and 10.0" W.C. for propane gas

NOTE: Only the primary manifold pressure should be adjusted on units equipped with two-stage or modulating gas controls. No adjustments to the low Fire manifold pressure are necessary on these units.

156-584.12

INSTALLATION - ELECTRICAL CONNECTIONSELECTRICAL CONNECTIONS

1. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.

2. All appliances must be wired strictly in accordance with wiring diagram furnished with the appliance. Any wiring different from the wiring diagram could result in a hazard to persons and property.

3. Any original factory wiring that requires replacement must be replaced with wiring material having a temperature rating of at least 105°C.

4. Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not 5% greater than rated voltage.

5. When the unit on/off toggle switch is in the “OFF” position, supply power remains energized at the rear of the switch. When a factory or field installed motor starting device such as a relay or contactor are present, supply power terminals of these components may remain energized even in the “OFF” position. When providing service on or near these terminals, de-energize building supply power to the unit.

CAUTIONEnsure that the supply voltage to the appliance, as indicated on the serial plate, is not 5% less than the rated voltage.

1. Installation of wiring must conform with local building codes, or in the absence of local codes, with the National Electric Code ANSI/NFPA 70 - Latest Edition. Unit must be electri cally grounded in conformance to this code. In Canada, wiring must comply with CSA C22.1, Part 1, Electrical Code.

2. Two copies of the unit wiring diagram are provided with each unit. One is located in the side access control compartment and the other is supplied in the literature packet. Refer to this diagram for all wiring connections.

3. Make sure all multi-voltage components (motors, transform-ers, etc.) are wired in accordance with the power supply voltage.

4. The power supply to the unit must be protected with a fused or circuit breaker switch.

5. The power supply must be within 5 percent of the voltage rating and each phase must be balanced within 2 percent of each other. If not, advise the utility company.

6. External electrical service connections that must be installed include:

a. Supply power connection (115, 208, 230, 460, or 575 volts). b. Connection of thermostats, or any other accessory control

devices that may be supplied (24 volts). NOTE: All units with supply voltage 208V and greater must use a field installed step-down transformer, available as a separate accessory. Refer to Table 15.1 for additional information on the required transformer.7. Refer to Figures 18.1 and 18.2 for the side access control

compartment location. 8. All supply power electrical connections are made in the side

access control compartment of the unit. The low voltage (thermostat and accessory control devices) can be wired to the terminals in the side access control compartment. Refer to the wiring diagram for the terminal location of all low voltage wiring.

W ARNING9. Separated combustion models include a factory installed on/

off toggle switch. The function of this switch is to disconnect power to the unit for maintenance or to shut the unit off in warm weather. Toggle switch is rated at 15amps at 125 volts or up to 3/4 HP at 125 volts.

16 6-584.12

ELECTRICAL CONNECTIONSLocation of thermostat should be determined by heating requirements and be mounted on an inside wall about 5' above floor level where it will not be affected by heat from the unit or other sources, or drafts from frequently opened doors. See instructions packed with thermostat.

Wiring Adjustments for Blower MotorsThe blowers used on Modine HDC units are direct drive and equipped with three speed motors. Air temperature rise of the unit is determined by the speed setting and the amount of static pressure in the system. Units are normally shipped with motors set at high speed. Motor speed is changed by connecting the motor lead for the desired fan speed to the “EAC” or “Blo” terminal of the control board. Unused motor leads for other speeds are placed on the “Park” terminals of the board. See the wiring diagram on page 21. When applying a blower equipped unit to a duct system or other load, consult the performance curves on this page to determine the air temperature rise for a given motor speed range and static pressure. Verify that the static pressure on the outlet of the unit does not exceed the maximum specified for the unit. If static pressure is too high it must be reduced either by modifications to the system or using the medium or low motor speed. If the unit shuts down on high limit during normal operation, a higher motor speed should be used.

INSTALLATION - ELECTRICAL CONNECTIONS

Blower Curve Models (HDC 60-125 Only)Speeds

Low Medium High

65

60

55

50

45

40

350.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80

1140

1235

1347

1481

1646

1852

2116

External Static Pressure (IN. WC)

Tem

per

atu

re R

ise

(Deg

. F)

HDC 100

CFM

70

65

60

55

50

45

40

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80

1235

1323

1425

1543

1684

1852

2058

2315

External Static Pressure (IN. WC)

Tem

per

atu

re R

ise

(Deg

. F)

75HDC 125

CFM

70

65

60

55

50

45

40

35

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70

794

855

926

1010

1111

1235

1389

1587

External Static Pressure (IN. WC)

Tem

per

atu

re R

ise

(Deg

. F)

CFM

HDC 75

70

65

60

55

50

45

40

35

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70

635

684

741

808

889

988

1111

1270

External Static Pressure (IN. WC)

Tem

per

atu

re R

ise

(Deg

. F)

CFM

HDC 60

176-584.12

INSTALLATION - OPERATION

OPERATION

Prior to OperationAlthough this unit has been assembled and fire-tested at the factory, the following pre-operational procedures should be performed to assure proper on-site operation.1. Turn off power to the unit at the disconnect switch. Check that

fuses or circuit breakers are in place and sized correctly. Turn all hand gas valves to the “OFF” position.

2. Remove the side control access panel.3. Check that the supply voltage matches the unit supply voltage

listed on the Model Identification plate. Verify that all wiring is secure and properly protected. Trace circuits to insure that the unit has been wired according to the wiring diagram. If installed at altitudes above 2,000' and the high altitude kit includes a combustion air proving switch, replace the switch in the unit with the switch provided in the kit. Take care to ensure that the tubing and electrical connections are securely fastened.

4. Check to insure that the venting system is installed correctly and free from obstructions. Before you start use the following steps to verify that the venting system is adequately sized: a. Seal any unused openings in the venting system. b. Inspect the venting system for proper size and horizontal

pitch, as required in the National Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA B149.1 Installation Code-latest edition and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies, which could cause an unsafe condition.

c. In so far as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building. Turn on clothes dryers and any exhaust fans such as range hoods and bathroom exhausts, so they shall operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.

d. Follow the lighting instructions. Place the appliance being inspected in operation. Adjust thermostat so that the appliance will operate continuously.

e. After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliance to their previous conditions of use.

f. If improper venting is observed during any of the above tests, the venting system must be corrected.

5. Check to see that there are no obstructions to the intake and discharge of the unit.

6. Check fan clearance. Fan should not contact casing when spun by hand.

7. Check to make sure that all filters are in place and that they are installed properly according to direction of air flow (if applicable).

8. Perform a visual inspection of the unit to make sure no damage has occurred during installation. Check to ensure all fasteners are in place and the burner openings are properly aligned with the heat exchanger tubes and that the gas orifices are centered in the burner inspirator tube opening.

9. Check that all horizontal deflector blades are open a minimum of 30° as measured from vertical.

10. Turn on power to the unit at the disconnect switch.11. Check the thermostat, ignition control, gas valve, and supply

fan blower motor for electrical operation. If these do not function, recheck the wiring diagram.

12. Check the blower wheel for proper direction of rotation when compared to the air flow direction arrow on the blower housing (if applicable). Blower wheel rotation, not air movement, must be checked as some air will be delivered through the unit with the blower wheel running backwards.

13. For blower units, check the blower speed (rpm). Refer to blower adjustments for modification.

14. Check the motor speed (rpm).15. Check the motor voltage. 16. Check the motor amp draw to make sure it does not exceed

the motor nameplate rating. 17. Recheck the gas supply pressure at the field installed

manual shut-off valve. The minimum inlet pressure should be 6" W.C. on natural gas and 11" W.C. on propane gas. The maximum inlet pressure for either gas is 14" W.C. If inlet pressure exceeds 14" W.C., a gas pressure regulator must be added upstream of the combination gas valve.

18. Open the field installed manual gas shut-off valve.19. Place the manual main gas valve on the combination gas

valve in the “ON” position. Call for heat with the thermostat.20. Check to make sure that the main gas valve opens. Check

the manifold gas pressure (see “Main Gas Adjustment”) while the supply fan blower is operating.

21. Check to insure that gas controls sequence properly (see “Control Operating Sequence”). If you are not familiar with the unit’s controls (i.e. combination gas control), refer to the control manufacturer’s literature supplied with the unit.

22. Once proper operation of the unit has been verified, remove any jumper wires that were required for testing.

24. Replace the side control access panel.25. If installed at altitudes above 2,000', affix label included with

high altitude kit and fill in all fields with a permanent marker.

Main Burner AdjustmentThe gas pressure regulator (integral to the combination gas control) is adjusted at the factory for average gas conditions. It is important that gas be supplied to the unit heater in accordance with the input rating on the serial plate. Actual input should be checked and necessary adjustments made after the unit heater is installed. Over-firing, a result of too high an input, reduces the life of the appliance and increases maintenance. Under no circumstances should the input exceed that shown on the serial plate. Measuring the manifold pressure is done at the outlet pressure tap of the gas valve.To Adjust the Manifold Pressure1. Move the field installed manual shut-off valve to the “OFF”

position.2. Remove the 1/8" pipe plug from the outlet pressure tap on

the gas valve and attach a water manometer of “U” tube type which is at least 12" high.

3. Move the field installed manual gas shut-off valve to the “ON” position.

4. Create a high-fire call for heat from the thermostat.5. Refer to Table 12.1 to determine the correct high fire manifold

pressure for the gas type of the unit. Pressures at 0-2,000' elevation are 3.5" W.C. for natural gas, 10" W.C. for propane gas, for elevations above 2,000' refer to the instructions on page 13. Adjust the main gas pressure regulator spring to achieve the proper manifold pressure (for location, see the combination gas control literature supplied with unit).

6. After adjustment, move the field installed manual shut-off valve to the “OFF” position and replace the 1/8" pipe plug.

7. After the plug is in place, move the field installed manual shut-off valve to the “ON” position and recheck pipe plugs for gas leaks with soap solution.

IMPORTANT1. To prevent premature heat exchanger failure, observe

heat exchanger tubes. If the tubes become red while blower and furnace are in operation, check to be sure the blower has been set to the proper rpm for the application. Refer to page 16 for blower adjustments.

2. Start-up and adjustment procedures must be performed by a qualified service agency.

18 6-584.12

Figure 18.2 - Unit Heater Rear View

CONTROL OPERATING SEQUENCE / UNIT COMPONENTS

Upon a call for heat from the thermostat, power is supplied to the power exhauster motor. The unit will go through a purge period and then the direct spark igniter will be energized. At the same time, the main valve in the combination control valve will open to allow gas to flow to the burners. If the fan motor has not

already started it will start shortly. If a flame is not sensed for any reason the main valve will close and there will be a short purge period before ignition is tried again. If the flame is not sensed after 4 tries there will be at least a one hour wait before ignition is tried again.

CONTROL OPERATING SEQUENCE

Figure 18.1 - Major Gas, Electrical Service, Safety and Other Components

1. Power Exhauster2. Pressure Switch3. Integrated Direct Spark Control Board4. Combination Gas Control

5. Control Transformer6. Flame Sensor (hidden)7. Flame Rollout Switch8. Auto Reset Limit Control (hidden)

9. Direct Spark Igniter (hidden)10. Manual Reset Control (hidden,

propeller 100-125 only)

jk l

m

n

o

p

q

r

s

Vent Pipe Connection

Gas Pipe

Access Panel with Lighting / Operating

Instructions

Electrical Access Holes

Fingerproof Fanguard

Fan Motor

Mounting Brackets

Table 18.1 - Control Options

Control Description

Control Service Thermostat Type of Model Code No. Voltage Voltage Gas Size

Single-Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry 11 115V 24V natural 30-125- Utilizes a single-stage combination gas control with ignition control. Gas is lit with a direct spark igniter on call for heat. 21 115V 24V propane 30-125

Two-Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry 12 115V 24V natural 75-125- Utilizes a two-stage combination gas control with built-in ignition control. Firing rate is 100% and 50% of full rated input. Gas is lit with a direct spark 22 115V 24V propane 75-125igniter on call for heat.

Combustion Air Inlet Pipe Connection

Flame Sight Glass

196-584.12

DIMENSIONS / GENERAL PERFORMANCE DATA - HDS/HDC

Table 19.1 - Dimensions (inches)

DimensionPropeller Model Size - HDS Blower Model Size - HDC

30 45 60 75 100 125 60 75 100/125A 26.8 26.8 26.8 26.8 35.5 35.5 26.8 26.8 35.5B 12.2 12.2 18 18 20.5 20.5 18 18 20.5C 16.5 16.5 16.5 16.5 22 22 16.5 16.5 22D 14.9 14.9 14.9 14.9 22.5 22.5 14.9 14.9 22.5E 10.1 10.1 15.9 15.9 18.4 18.4 15.9 15.9 18.4F 7.25 7.25 10.75 10.75 14 14 10.75 10.75 14G 18.5 18.5 18.5 18.5 - – 18.5 18.5 –H 7.6 7.6 7.835 7.835 8.4 8.4 7.835 7.835 8.4I 34.5 34.5 34.5 34.5 43 43 35.5 35.5 44.5J 22 22 25 25 30.67 30.74 32.5 32.5 41.5K 2.74 2.74 3.15 3.15 3.87 3.87 3.15 3.15 3.87L 3.19 3.19 5.55 5.55 10.73 10.73 5.55 5.55 10.73

Vent and Combustion Air Connector Size 3 3 4 4 4 4 4 4 4

Gas Connection 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2Fan or Blower Diameter 10 10 14 14 18 18 9 - 7 9 - 7 10 - 10

Approx. Weight (lbs.) 55 60 80 85 125 125 92 97 151

14.9" BETWEEN 3/8"-16 MOUNTING HOLES(MODEL SIZES 100 AND 125 ONLY)

3.5"10.0"

13.5" BETWEEN 3/8"-16 MOUNTING HOLES(MODEL SIZES 100 AND 125 ONLY)

Figure 19.2 - Mounting Bracket Slot Locations1” - angle, mounting brackets are slotted to accommodate joists on 16” or 24” centerlines.

HDS/HDC30-75

HDS/HDC100/125

(accessory)

.00

1.10

3.10

5.10

7.10

9.10

17.1

0

19.1

0

21.1

0

23.1

0

25.1

026

.20

.00

1.50

3.50

5.50

7.50

9.50

11.5

0

13.5

0

21.5

0

23.5

0

25.5

0

27.5

0

29.5

0

31.5

0

33.5

035

.00

HDS/HDC30-75

HDS/HDC100/125

(accessory)

.00

1.10

3.10

5.10

7.10

9.10

17.1

0

19.1

0

21.1

0

23.1

0

25.1

026

.20

.00

1.50

3.50

5.50

7.50

9.50

11.5

0

13.5

0

21.5

0

23.5

0

25.5

0

27.5

0

29.5

0

31.5

0

33.5

035

.00

Table 19.2 - Propeller Model HDS Performance Table 19.3 - Blower Model HDC Performance Model HDS Sizes

30 45 60 75 100 125Btu/Hr Input 30,000 45,000 60,000 75,000 100,000 125,000

Btu/Hr Output 24,600 36,900 49,200 61,500 82,000 102,500Entering Airflow (CFM) @ 70°F 505 720 990 1160 1490 1980

Outlet Velocity (FPM) 523 725 653 769 565 747Air Temp. Rise (°F) 44 46 45 48 50 47

Max. Mounting Height (Ft.) 10 10 12 14 12 16Heat Throw (Ft.) (@ Max Mtg Ht.) 25 27 36 38 42 56

Motor Type SP SP PSC PSC SP PSCMotor HP 1/15 1/15 1/12 1/12 1/12 1/8

Motor RPM 1550 1550 1625 1625 1050 1625

Model HDC Sizes60 75 100 125

Btu/Hr Input j 60,000 75,000 100,000 125,000Btu/Hr Output j 49,200 61,500 82,00 102,500

Entering Airflow Range (CFM) 635-1111 794-1389 1140-2116 1235-2058 Outlet Velocity (FPM) 437-726 546-908 443-781 488-773

Air Temp. Rise (°F) 40-70 40-70 35-65 45-75 Max. Mounting Height (Ft.) k 7-13 7-16 8-19 8-17

Heat Throw (Ft.) (@ Max Mtg Ht.) k 20-45 24-57 27-68 27-59

Motor Type l P.S.C. P.S.C. P.S.C. P.S.C.Motor HP 1/4 1/3 1/2 1/2

Motor RPM Max 1100 Max 1100 Max 1100 Max 1100j Ratings shown are for elevations up to 2,000 feet. For elevations above 2,000 feet,

ratings should be reduced at the rate of 4% for each 1,000 feet above sea level. (In Canada see rating plate.) Reduction of ratings requires use of a high altitude kit.

k Data taken at 55°F air temperature rise. At 65°F ambient and unit fired at full-rated input. Mounting height as measured from bottom of unit, and without deflector hoods.

Figure 19.1 - Dimensional Drawings

20 6-584.12

SERVICE / MAINTENANCE / TROUBLESHOOTING

To check most of the possible remedies in the troubleshooting guide listed in Table 20.1, refer to the applicable sections of the manual.

General MaintenanceThe unit and venting system must be checked once a year by a qualified service technician.All installation and service of these units must be performed by a qualified installation and service agency.Before any service, BE SURE TO TURN OFF GAS AT THE MANUAL SHUT-OFF VALVE AHEAD OF THE COMBINATION GAS CONTROL AND TURN OFF ALL ELECTRIC POWER TO THE HEATER.

1. Service air moving components annually. a. Check fan for fit on motor shaft and for damage to blades.2. Keep unit free from dust, dirt, grease, and foreign matter, paying particular attention to: a. Combustion air inlets. b. Burners and burner orifices. Turn off gas ahead of the

combination gas control and shut off electric power to the heater. Remove the access panel, open the union on the gas line, and disconnect the igniter and sensor wires. Remove the screws that attach the burner tray to the header plate and remove the burner tray and manifold assembly from the heater. Carefully clean the burners with a wire brush or other suitable means. Replace any damaged or deteriorating burners or orifices. Install the burner assembly back on to the header making certain that all screws, pipes and electrical connections are tight.

CAUTION: Be careful when handling the igniter and flame sensor.3. Inspect the flame sensor and igniter for deterioration and/or

cracks.4. Verify that the burners are touching each other at the

carryover points. This will ensure flame carryover from burner to burner.

a. Clean exterior of heat exchanger tubes. b. Fan blade.5. Check wiring for possible loose connections.6. Controls – The gas valves and piping should be checked

annually for general cleanliness and tightness. The gas controls should be checked to insure that the unit is operating properly. See control instruction sheets furnished separately with the unit heater.

7. Power exhaust assembly/motors – The power exhaust motor bearings have been lubricated for long life and do not require additional lubrication. In dirty atmosphere, it may be desirable to clean the motors and blower housing and blow out the cooling air passages of the motor with compressed air.

8. Perform periodic cleaning of inlet and vent terminal screens.

CAUTION1. Service or repair of this equipment must be performed by

a qualified service agency.2. Do not attempt to reuse any mechanical or electrical

controllers which have been wet. Replace defective controller.

WARNINGWhen servicing or repairing this equipment, use only factory-approved service replacement parts. A complete replacement parts list may be obtained by contacting the factory. Refer to the rating plate on the appliance for complete appliance model number, serial number, and company address. Any substitution of parts or controls not approved by the factory will be at the owner’s risk.

Table 20.1 - Troubleshooting

TROUBLE POSSIBLE CAUSE POSSIBLE REMEDYUnit does nothing 1. Power supply is off 1. Turn on main power 2. No 24V power to thermostat 2 a. Check control transformer b. If failed transformer - check thermostat wire gage and length 3. Thermostat malfunction 3 a. Verify wire connections to R&W terminals only b. Check / replace thermostat 4. LED flashes 4. Check LED flash code 5. Blown fuse on control board 5. Replace fuse 6. Defective control 6. Replace control

LED light off or 1. Blown fuse on control board 1. Replace fuse flashing 2. Multiple causes 2. Control board LED flash codes vary with control type. A decal is installed in the unit giving a brief description of the applicable codes for your heater. For more detail, see the control board data sheet included with the unit.

Unit starts but does 1. Main gas is off 1. Open manual gas valve not ignite 2. Air in gas line 2. Purge gas line 3. Main or manifold gas pressure 3. Set gas pressures per manual instructions 4. Check gas valve switch 4. Set gas valve switch to “ON” position

Unit goes through cycle 1. Reversed main power polarity 1. Black wire - HOT, White wire - NEUTRAL, Green wire - GROUNDbut the burners go out 2. Unit not grounded 2. Ground unit and verify quality of ground connectionin less then 10 seconds 3. Flame not sensed 3. Check flame sense probe and connection Air circulating fan 1. Loose connections 1. Check all connectionsinoperable 2. Defective control board 2. Check control board data sheet and function 3. Defective fan motor 3. Check fan motor

216-584.12

UNIT WIRING

Since internal or factory wiring may vary depending on the controls manufacturer, the wiring diagrams must be appropriately selected with the proper gas valve and ignition

type. The following wiring diagram represents a unit equipped with a single stage gas valve, and direct spark ignition.

Wiring Diagram Selection

Figure 21.1 - Unit Heater Wiring Diagram (Single and Two Stage, Direct Spark Ignition)

SINGLE STAGE, DIRECT SPARK IGNITION,SHUT-OFF, MULTIPLE RETRY W/ AUTO RESET FROM LOCKOUT

1 4 7852

3 6 9

G

W

R

C

Y

GND

O

WH

COM

L1, (BK)

R

YPIN 6 120

R

COM

24

R

FANMOTOR

Y

WH

BKSEC

PIN 5Y

XFMR

PRESSURESWITCH

PEMOTOR

LIMITCONTROL

GASVALVE

115V/60HZ/1Ø POWERCIRCUIT BREAKER (BY OTHERS)

FLAMESENSOR

BL

GR, (G)

BK

L2, (

WH

)

L2, (WH)

NEUTRAL

IND

L1

L1

EAC

PARK

SPARKIGNITOR

UTLABEL

IGNITIONCONTROL

PARK

LIMIT CONTROL(SEE NOTE 5)

L1, (

BK

)

SWITCH REFER NOTE 7

FLAME ROLLOUTS(SEE NOTE 6)

CALL FOR FAN

LOW VOLTAGETHERMOSTAT(BY OTHERS)

CALL FOR HEAT

TWO STAGE, DIRECT SPARK IGNITION,5H0799630002 REV M

100% SHUT-OFF, MULTIPLE RETRY W/ AUTO RESET FROM LOCKOUT

1 4 7852

3 6 9

G

W1

C

R

Y

GND

O

WH

COM

L1, (BK)

R

Y 120

R

COM

24

R

FANMOTOR

Y

WH

BK24V

PIN 8Y

XFMR

PRESSURESWITCH

PEMOTOR

CALL FOR FAN

LIMITCONTROL

COM 115V/60HZ/1Ø POWERCIRCUIT BREAKER (BY OTHERS)

FLAMESENSOR

BL

BK

L2, (

WH

)

L2, (WH)

FS

L1

HEAT

PARK

SPARKIGNITOR

UTLABEL

IGNITIONCONTROL

PARK

FLAME ROLLOUTS(SEE NOTE 6)

IND

WHITE ROGERSGAS VALVE

COM

HIM

W2LOW VOLTAGETHERMOSTAT(BY OTHERS)

1ST STAGE2ND STAGE

LIMIT CONTROL(SEE NOTE 5)

L1, (

BK

)

SWITCH REFER NOTE 7

SIN

GLE

STA

GE,

DIR

ECT

SPAR

K IG

NIT

ION

, 100

% S

HU

TOFF

, M

ULT

IPLE

RE

TRY

W/A

UTO

RE

SE

T FR

OM

LO

CK

OU

TTW

O S

TAG

E, D

IRE

CT

SPA

RK

IGN

ITIO

N, 1

00%

SH

UTO

FF,

MU

LTIP

LE R

ETR

Y W

/AU

TO R

ES

ET

FRO

M L

OC

KO

UT

22 6-584.12

Replacement PartsWhen requesting parts please contact your local representative. Please have full model and serial number available. If you require assistance in locating your representative, please call the number located on the back page.

SERIAL & MODEL NUMBER / REPLACEMENT PARTS

Figure 22.1 - Model Number Designations (Remove access cover to locate)

Figure 22.2 - Serial Number Designations (Remove access cover to locate)

CONTROL SUPPLIER

SERIAL NUMBER

GAS VALVE SUPPLIER

YEAR OF MANUFACTURE

S 3 0 0 1 1 7 9 9 8 2 3 41 1 10 0 0 0 0 0 0 0SPO NUMBER

SPO MODEL

FAN VENDOR CODEMOTOR SUPPLIER

UNIT SERIES

05 - Universal15 - Marathon

00 - Original 01 - ModifiedWEEK OF

MANUFACTURESEQUENTIAL NUMBER